package com.wzl.policy.factory;

import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.stereotype.Component;

/**
 * 动态加载bean
 *
 * @author weizhongli
 * @since 2022-08-31 13:39
 */
@Component
public class GetBeanUtil implements ApplicationContextAware {

    private static ApplicationContext applicationContext;

    /**
     * 实现ApplicationContextAware接口的回调方法，设置上下文环境
     * @param applicationContext the ApplicationContext object to be used by this object
     * @throws BeansException
     */
    @Override
    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
        if(GetBeanUtil.applicationContext == null) {
            GetBeanUtil.applicationContext = applicationContext;
        }
    }

    /**
     * @return ApplicationContext
     */
    public static ApplicationContext getApplicationContext() {
        return applicationContext;
    }

    /**
     * 获取对象
     * 这里重写了bean方法，起主要作用
     * @param name
     * @return Object 一个以所给名字注册的bean的实例
     * @throws BeansException
     */
    public static Object getBean(String name) throws BeansException {
        return applicationContext.getBean(name);
    }

    public static <T> T getBean(Class<T> requiredType) {

        return applicationContext.getBean(requiredType);

    }

    /**
     * 获取bean
     * @param c c
     * @param  name 名称
     * @param <T> 泛型
     * @return T 泛型
     */
    public static <T> T getBean(String name, Class<T> c) {
        return getApplicationContext().getBean(name, c);
    }

}